Wave Optics questions with solutions

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• NumericmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  In a Young double-slit experiment, a transparent mica sheet of refractive index 1.56 is placed in front of one slit. The central fringe shifts to the position originally occupied by the 7th bright fringe when both slits were uncovered. If the wavelength is 450 nm and the sheet thickness is α×10⁻⁹ m, find α.

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  JEE Mains 2026 4 April Evening Shift

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• MCQeasyWave OpticsHuygens' Principle & Interference of Light

  In interference pattern from two coherent light sources of intensity ratio n, the ratio (Iₘₐₓ - Iₘᵢₙ)/(Iₘₐₓ + Iₘᵢₙ) is:

  Options

  • Option A

    √n/(n + 1)

  • Option B

    2√n/(n + 1)

  • Option C

    √n/(n + 1)²

  • Option D

    2√n/(n + 1)²

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  NEET Phase-II 2016NEET Previous Year

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• MCQmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  Two identical slits S₁ and S₂ are illuminated by a point source P. Let the source-to-slit and slit-to-Q path segments be λ₁, λ₂, λ₃ and λ₄ as shown. Which condition gives destructive interference at Q?

  

  Options

  • Option A

    (λ₁ - λ₂) = (2n + 1)λ/2

  • Option B

    (λ₃ - λ₄) = (2n + 1)λ/2

  • Option C

    (λ₁ + λ₂) - (λ₃ + λ₄) = nλ

  • Option D

    (λ₁ + λ₃) - (λ₂ + λ₄) = (2n + 1)λ/2

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• MCQeasyWave OpticsDiffraction of Light

  Which of the following phenomena does not explain by wave nature of light.

  (A) reflection
  (B) diffraction
  (C) photoelectric effect
  (D) interference (E) polarization

  Choose the most appropriate answer from the options given below :

  Options

  • Option A

    E only

  • Option B

    C only

  • Option C

    B, D only

  • Option D

    A, C only

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  JEE Mains 2024 06 Apr Morning Shift

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• Multi-correctmediumWave Optics

  A glass plate of refractive index μ₃ is coated with a thin layer of thickness t and refractive index μ₂, where μ₂>μ₃. Light of wavelength λ in air is incident normally on the layer. Choose the correct option(s) for interference of the two reflected waves.

  Select all that apply

  • Option A

    Constructive if t=(n+1/2)λ/(2μ₂)

  • Option B

    Constructive if t=(n+1/2)λ/(2μ₃)

  • Option C

    Destructive if t=nλ/(2μ₂)

  • Option D

    Destructive if t=nλ/(2μ₃)

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• MCQmediumWave Optics

  A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of ‘a’ for which first minimum appears at θ = 30° on the screen will be:

  Options

  • Option A

    0.6 μm

  • Option B

    1.2 μm

  • Option C

    1.8 μm

  • Option D

    3 μm

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  JEE Mains 2023

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• MCQmediumWave Optics

  A polaroid is placed at 45° to an incoming light of intensity Io. Now the intensity of light passing through polaroid after polarisation would be

  Options

  • Option A

    Io

  • Option B

    Io/2

  • Option C

    Io/4

  • Option D

    Zero

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• MCQeasyWave OpticsYoung's Double-Slit Experiment (YDSE)

  For Young’s double-slit experiment, Statement I: If the screen is moved away from the plane of slits, angular separation of fringes remains constant. Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, angular separation of fringes decreases. Choose the correct answer.

  Options

  • Option A

    Statement I is true but Statement II is false.

  • Option B

    Statement I is false but Statement II is true.

  • Option C

    Both statements are true.

  • Option D

    Both statements are false.

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  NEET 2023NEET Previous Year

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• MCQeasyWave OpticsYoung's Double-Slit Experiment (YDSE)

  In Young’s double-slit experiment, the intensity of light at a point on the screen where path difference is λ is K. The intensity at a point where path difference is λ/4 will be:

  Options

  • Option A

    K

  • Option B

    K/4

  • Option C

    K/2

  • Option D

    zero

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  AIPMT 2014NEET Previous Year

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• MCQmediumWave Optics

  A point source S is placed in front of a perfectly reflecting mirror as shown. A screen is at equal distance a on the other side. The intensity at the centre of the screen is I with the mirror present. If the mirror is removed, what is the intensity at the centre?

  

  Options

  • Option A

    I

  • Option B

    10I/9

  • Option C

    9I/10

  • Option D

    2I

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